Discussion about the Korg PolySix synthesizer

I just did a battery transplant on a polysix i just got that had a 
leaky battery... not too bad, but there were a few (4-5) blackened 
traces around IC31, but they all tested as conductive, so I left them 
alone.So upon reassembly the LEDs for bank A and #1 stay on all the 
time. the other LEDs all go on/off as you push their buttons, but A and 
1 stay lit. And  new writing doesnt seem to enter the memory (no 
recall). Would those 4-5 traces around IC31 be the problem?  Could IC31 
itself be bad? what does it do? Is IC31 the "memory chip"? The rest of 
the board seems fine. Any ideas?

Based on Old Crow's stuff, ic 31 isn't a memory chip, it's a gate
that's used sometimes for controlling leds and in this case it does.
So that's your LED problem most likely.

Just from experience with corrosion; it can travel in ways that you
wouldn't think are possible. It can travel through wire harnesses and
cause traces on other sides of boards to errode.

I'd just double check with Old Crow's schematics based on what you
have issues with.

--- In PolySix@yahoogroups.com, "spistrich" <wasteking@...> wrote:

>
> I just did a battery transplant on a polysix i just got that had a 
> leaky battery... not too bad, but there were a few (4-5) blackened 
> traces around IC31, but they all tested as conductive, so I left them 
> alone.So upon reassembly the LEDs for bank A and #1 stay on all the 
> time. the other LEDs all go on/off as you push their buttons, but A and 
> 1 stay lit. And  new writing doesnt seem to enter the memory (no 
> recall). Would those 4-5 traces around IC31 be the problem?  Could IC31 
> itself be bad? what does it do? Is IC31 the "memory chip"? The rest of 
> the board seems fine. Any ideas?
>

black traces are bad.  They will continue to corrode and spread
cancer.  You should clean it all away.

On 5/14/07, spistrich <wasteking@verizon.net> wrote:
> I just did a battery transplant on a polysix i just got that had a
> leaky battery... not too bad, but there were a few (4-5) blackened
> traces around IC31, but they all tested as conductive, so I left them
> alone.So upon reassembly the LEDs for bank A and #1 stay on all the
> time. the other LEDs all go on/off as you push their buttons, but A and
> 1 stay lit. And  new writing doesnt seem to enter the memory (no
> recall). Would those 4-5 traces around IC31 be the problem?  Could IC31
> itself be bad? what does it do? Is IC31 the "memory chip"? The rest of
> the board seems fine. Any ideas?
>
>
>
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> Yahoo! Groups Links
>
>
>
>


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-Chromatest J. Pantsmaker
http://www.chromatest.net